The Financial PostLưu trữ 2008-10-09 tại Wayback Machine on Dale Carnegie: "Dale Carnegie's How to Win Friends and Influence People, the gold standard of the genre, has sold more than 15 million copies since it was first published in 1937." (ngày 24 tháng 4 năm 2008)
The Financial PostLưu trữ 2008-10-09 tại Wayback Machine on Dale Carnegie: "Dale Carnegie's How to Win Friends and Influence People, the gold standard of the genre, has sold more than 15 million copies since it was first published in 1937." (ngày 24 tháng 4 năm 2008)